code: def rfc822_escape(header):
      """Return a version of the string escaped for inclusion in an
      RFC-822 header, by ensuring there are 8 spaces space after each newline.
      """
      lines = header.split("\n")
      sep = "\n" + 8 * " "
      return sep.join(lines)
  
imports: import importlib.util
  import os
  import re
  import string
  import subprocess
  import sys
  import sysconfig
  import functools
  from .errors import DistutilsPlatformError, DistutilsByteCompileError
  from ._modified import newer
  from .spawn import spawn
  from ._log import log
label_desc: Use image node_id 18 for calling a global function with example usage: rfc822_escape(header) and returns: sep